Implement construction



July 8, 1941- o. w. DoMRlEs 248m IMPLMENT CONSTRUCTION Filed June 12, 1940 2 Sheets-Sheet l lrllllllll. .dni Y W75. iii),

O. W. DOMRIES IMPLEMENT CONSTRUCTION 4 Filed June -12, 1940 u llinnlfunlrlll July 8, A1941.

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Patented July 8, 1941 UNITED STATES PATENT OFFICE IMPLEMENT CONSTRUCTION Application June 12, 1940, Serial No. 340,106

2.0 Claims.

My invention relates in general to ground working imiplement constructions, and has among its general objects the provision of such a construction Which is inexpensive in fabrication and quickly assembled, which does not require frequent lubrication, and in which the engaging parts subjected to wear are bathed in lubricant.

My invention finds particular utility in its application to disc harrows, and it will be described as embodied in an offset disc harrow construction without limiting the invention to such use. In the conventional offset disc harrow construction the discs are mounted upon a rotating member which is supported by a fixed shaft or axle. The resistanceof the ground to the forward movement of the discs in Working position causes an axial thrust of very substantial amount to be exerted by the disc and the rotating member upon the stationary shaft or axle. tion to provide novel means for transmitting this thrust from the rotating elements to the xed elements.

During the operation of a disc harrow, there is a tendency for the earth turned by the discs to find its way between the stationary axle and the rotating disc supporting member mounted thereon, where it exerts a detrimental abrasive action on the thrust bearing surfaces.

It is another object of my invention 'to provide a disc harrow construction including a lubricant chamber in which the thrust bearing surfaces operate, which chamber is sealed against the entrance of earth and foreign matter there- Even when such bearing surfaces are so sealed in a lubricant chamber, they are subjected to the abrasive action of some earth and foreign matter, as well as particles of metal Worn therefrom during the use of the tool.

It is another object of my invention to provide a construction of the class described, which includes means for removing continuously during the operation of ythe tool the abrasives, such as described, from the bearing surfaces, whereby the effective life of the surfaces is substantially prolonged. My invention accomplishes such purpose by making the thrust bearing surfaces incongruent and not (3o-extensive, and by providing means for maintaining such bearing surfaces submerged, or at least partially submerged, in lubricant during their operation, so that any abrasives deposited upon one of the bearing surfaces is washed therefrom by the bath of lubricant, and wiped therefrom by the other bearing It is a more specific object of my invensurface, and thus prevented from passing between the engaging bearing surfaces.

Other purposes of my invention are to provide a construction of the class described, having exceptionally effective packing means for sealing the lubricant chamber, means for adjustment of the thrust bearing members to compensate for wear, means facilitating the replacement of worn bearing members, and the quick assembly of the tool from parts requiring no accurate machine work.

An embodiment of the invention, accomplishing the foregoing purposes and providing the foregoing advantages and others, is hereinafter described. This description may be better understood with reference to the accompanying drawings in which:

Fig. 1 is a plan view of an offset disc harrow embodying my invention;

Fig. 2 is an enlarged sectional view taken as indicated by the line 2-2 of Fig. 1;

Fig. 3 is an enlarged sectional view taken as indicated by the line 3 3 of Fig. 2;

Fig. 4 is an enlarged fragmentary sectional View illustrating the construction of the packing means included in the embodiment illustrated in Fig. 2;

Fig. 5 is a fragmentary sectional view illustrating a modified form of packing construction;

Fig. 6 is an enlarged sectional view taken as indicated by the line 6 6 of Fig. 5;

Fig. '7 is a sectional View illustrating a modified form of thrust pin construction;

Fig. 8 is a fragmentary sectional view illustrating a modified form of lubricant supply means;

Fig. 9 is a section similar to Fig. 2 of a further modied form of the invention; and

Fig. l0 is an enlarged sectional view taken as indicated by line Ill-I0 of Fig. 9.

Referring to the drawings, which are for illustrative purposes only, the numeral Il indicates an offset disc harrow, including a front frame I2 and rear frame I3 pivoted together at I4 for movement between working and nonworking positions; secured to the forward end of the front frame I2 are drawbars I5, which are connected in any suitable manner, not shown, to a tractive vehicle. A stay bar I6 is pivoted to the rear frame I3 and engages a stop I'I on the front frame I2, a release bar I8 being connected thereto for actuation from the tractive vehicle to release the stay bar.

Each of the frames I2 and I3 includes side or frame members .I9 and 20, which in the form i1- lustrated are angles, to which depending hangers the hanger 2 I.

2| are secured by bolts 22. One of the hangers 2| is connected to the inner side of the vertical leg of a frame member 20, and the other of the hangers 2| is connected to the outer side of the vertical leg of the frame member I9, for apurpose which will be later described.

Attached to each of the hangers 2| is a shalt or stub axle 23. yEach of the stub axles 23 is non-rotatably secured to its hanger 2 I, as by the projection of a reduced end 24, non-cylindrical in cross-section, through an opening 25 of similar outline in the hanger 2|, and the threading of a bolt 26 into this reduced end 24 and against and needY not be machined.

Mounted upon the stub axles 23 for rotation thereon is a tool or disc supporting member or tubular member 21. The tubular member 21 has a cylindrical bore 28 oi diameter slightly greater than the diameter of the stub axles 23. The tubular member 21 is provided with a substantially semi-cylindrical hollow key 29 lextending parallel to the axis of the tubular member throughout its length Yand secured thereto as by spot welding, and dening a chamber- 23a between the key and the tubular member. A stop plate 30 is mounted upon one end of the tubular member 21 and nonrotatably secured thereto as by spot'welding. A plurality of discs 3| are also mounted upon the tubular member 21. Each of the discs has a central opening 32 and a recess or way connecting therewith for slidably receiving the key 29 upon the tubular member 21, so that when the discs 3| are slid upon the tubular member 21 they are held againstV rotation relative thereto. Y l

As is well illustrated in Fig. 2, adjacent discs 3| are retained in their proper position axially of the tubular member 21 by spacing spools 33. Each of the spacing spools 33 has one end enlarged, as indicated by the numeral r34, forengaging the concave side of one of the -discs 3|, and is provided at its other end with an enlargement of greater diameter, as indicated by the numeral 35,` for engaging the convex side of the adjacent disc. Intermediate the enlarged ends 34 and 35, each of the spacing spools 33 is formed with a cylindrical portion 35 having a bore 31 appreciably larger than the external diameter of the tubular member r21. A pair of annular ilanges 38 project inwardly of the cylindrical portion 35 for engagement with the tubular member 21. Each of the spacing spools 33 includes a recess or way 3S to receive the key 29 of the tubular member 21 to retain the spacing spools against rotation relative thereto.V V

On that end of the tubular member 21 opposite Vto the end plate 33 is Aa lock plate 4|).which engages the concave side of the end disc. A nut 4| isthreaded upon the end of the tubular member 21 against'the locking plat-e 43, and is held against-rotation by a key 42 projecting into a radial and longitudinal opening 43 in the locking plate 40. In order to transmit thrusts from the discs 3| Y and the tubular member 21 to the stub shaft 23 and frame members I9 and 23, I provide a thrust bearing means or member in the form of a pin 44'Which spans the tubular member 21 diametrically across the cylindrical bore therein, adjacent the inner end of each of the stub shafts 23. The pins 44 may be hardened, if desired, to prolong their life, and, in the embodiment illustrated in Fig. 2, are secured to the tubular member by The stub axles 23 are cylindrical along each of the stub shafts 23.

welding before the spools 33 and discs 3| are assembled thereon.

The stub shafts 23 each project into the tubular member 21 a distance less than one-half the length of the tubular member 21, and preferably extend into the tubular member 21 only to the extent necessary to provide adequate rotary bearing Contact therewith. There is thus provided within the tubular member 21 and between the inner ends of the stub shafts 23 a lubricant reservoir 45 of considerable Volume. In the embodiment illustrated in Fig. 2 lubricant is supplied to this reservoir 45 through an opening 46 in the tubular member 21, and a registering open ing 41 in the cylindrical portion 36 of one of the spools 33. The opening 43 is closed by a suitable lubricant iitting 48 that extends through opening 41, the fitting permitting the passage of lubricant into the reservoir 45 and preventing its passage outwardly therefrom.

In order to prevent the escape of lubricant from the reservoir 45 along the stub shafts 23, and prevent the entrance of abrasives and foreign matter into the reservoir 45 along the stub shafts 23, I provide adjacent each end of the tubular member 21 an annular channel 49 in each of the stub shafts 23. Each of theV annular channels 49 defines an annular chamber with the surrounding tubular member 21. vAs is best illustrated in Fig. 4, a packing member 50 isV disposed in the channel 49. 'Ihe packing inember 5I), which may be formed of cork or the like, having some resilience, is of a width substantiallyl equal to the width of the channel 49, so that its edges engage side walls 5| of the channel 49. The packing member 53 is of a length such that its ends abut each other when in position engaging the inner Wall of the tubular member 21. Thepacking member 53 is retained in engagement with the inner wall of the tubular member 21 by its resilience.

A plurality of packing means sealing the lubricant in the reservoir 45 and preventing the entrance of abrasives thereto may be provided In the embodiment illustrate in Fig. 5, I have shown three packing chambers or channels 49 in each of the stub shafts 23. I may also employ packing members which include a spring means forinsuring intimate contact of the packing element with the inner Wall of the tubular member 21. Thus, as is shown in Fig. 5, a band of resilient metal 52 may be disposed Within the packing element 53, urging it outward into contact with the inner wall of the tubular member 21.

Means other than that illustrated in Fig. 2 and previously described, for supplying lubricant to the reservoir e5, may be utilized. For example,

as shown in Fig. 8, one or both of the stub shafts 23 may be provided with a longitudinal passage 573 extending throughout the length of the stub shaft, with an enlarged portionv 54 at the outer end thereof, in which a closure member or lubricant tting 55, is secured. In such construction it is preferable to offset the inner end of the passage 53 from the center of the stub shaft 23, as illustrated in Fig. 8, or to provide the outlet of the passage 53 in the side of the stub shaft 23, so that the engaging thrust pin 44 offers no impediment to the travel of lubricant from the passage 53 to the reservoir 45.

' To provide for the easy replacement of the thrust pins when they become worn, it is sometimes desirable to attach themF to the tubular member 21 by means other than-welding. `As

`ing 56 in the tubular lmember 21 .for receiving the reduced end .51 of afthrust pin 58. A second radial opening 59 inthe tubular member 21 is formed diametrically opposite the opening E. The wall of this second opening is provided with threads so that athreaded end Gli of the thrust pin 53 may be secured therein. A vslot 6| in the end of the thrust pin 58 Afor cooperation with a screw-driver .permits it to be easily installed and removed from the tubular member 21.

In assembling my bearing construction the stop plate 3@ isfirst secured to one end of the tubular member 21 as'by welding. Thereafter, the thrust pins ill are secured .to the tubular member '21 by welding or by threading 'each thrust pin into the threaded openingprovided in the tubular member. A disc 3i is thenslid upon the tubular member 21 so that the recess communicating with the central opening 32 receives the semi-cylindrical key 29 of the tubular member 21. A spacing spool 33 is then slid upon the'tubular member 21 until its enlarged end -34 engages the concave side of the installed disc 3l, the recess or way 39 of the spacing spool receiving the semi-cylindrical key 29 of the tubular member 21. Thereafter a Isecond disc is slid upon the tubular member 21 in the same manner that the first disc was installed, until its convex side engages the enlarged side 35 of the installed spacing spool T33. Additional spacing spools and discs are alternately installed until the required number are assembled. The locking plate 4l) is placed upon the end of the tubular member 21 against the concave side of the end disc 3l. The nut 4I is then vthreaded upon the end of the tubular member'Z'l against the locking plate MJ, thus securing the assembled discs and spacing spools together upon the tubular member. The key 42 in the opening 43 of the locking plate MJ is then bent around the nut 4I to retain it against rotation.

The stub axles'23 attached to the hangers 22 may then be inserted into the tubular member 21, the packing members 59 being held in proper position in the annular chambers l!!! during this step. Thereafter the vhangers 2l are secured by the bolts Z2 to the frame members i9 and 2G.' As is well illustrated in Fig, 2, shims 62 may be provided between either or'bo-th of the hangers 2l and its associated frame member. By adding shims between the hanger 2l and the frame member 20, or removing shims from between the hanger 2| and the frame member I9, the stub axles 23 may be moved more closely together, and by the reverse process the stubaxles may be moved further apart. By such an arrangement it is possible upon assembling the tool to insure that the ends of the stub axles 23 are in close engagement with the thrust pins 44, and it is possible when the pins or the ends of the stub axles become worn, to move the stub axles closer together, and thus compensate for wear.

Thereafter the tting 48 is secured in the openings 45 and 41 of the tubular member 21 and the spool 33 respectively, and a lubricant is supplied through the fitting luntil the reservoir i5 is completely filled.

During the operation of the narrow, a thrust is exerted by the .earth upon the discs, tending to move them along the stub axles 23 towards that end of the frame towards which the convex sides of the discs are faced. Thus in Fig. 2 this thrust is exerted towards the right frame member I9. This thrust is transmitted from the `axle 23, .and thence tothe frame. ytool could fbe built employing only one of the thrust members 44, if it were employed under right-hand pin 44 against the right-hand stub A workable uniform conditions. However, dueto the lack of uniformity in actual practice and due to the fact that two such thrust members may be provided at extremely small expense, I prefer to employtwo thrust pins, as illustrated in Fig. 2.

It will be seen that the packing members '50 prevent the escape of lubricant from the reservoir 45 and the entrance of dirt and abrasive matter thereinto between the tubular lmember 21 and the stub shaft 23. It will be noted that 'the bearing surface of each of the pins 44 -is incongruent with and less extensive than its companion bearing surface upon the end of a stub shaft 23, Consequently, during successive stages of the relative rotation of these bearing surfaces, successive portions of the bearing surface on the inner end of each of the stub shafts are out 'of engai-gement with the companion pin 44. These unengaged portions of the bearing surfaces are in contact with and Washed by the body of lubricant within the reservoir 45. Any small amount of dirt or abrasive matter which may find entrance to the reservoir 45, together `with anyparticles of metal worn from the bearing surfaces, are therefore washed from the unengaged portions of the 'bearing surfaces ofthe stub laxles by the lubricant, and are wiped therefrom by lthe pins iid, and thus effectively prevented from passing between the thrust bearing surfaces in engagement.

The modification of my invention indicated by Figs. 9 and 10 consists essentially of the sube stitution of a double tube 'generally designated 1li for the single tubular member 21, the construc- 'tion being in other respects similar to that shown in Figs. 1 t/o 4, and corresponding numerals being used to indicate corresponding parts. The

Idouble tube 10 comprises an inner tubular member 1I and an outer tubular member or'disc support l12 defining therewith an annular space 13. Corresponding ends of the two tubular 'members yare welded to common rings or bushings l14 that ser-ve to seal the opposite ends of the annular Adisc-s 3| through the tubular member 21 and the 75 space 13. y

The inner tubular member 1I Ahas 'the previously described relationship to the two stub vshafts 23, the inner tubular member rotatably "embracing'the two shafts and providing a cylindrical space 15 between the two shafts. It is contemplated that the inner tubular member 1| will'h'ave at least one aperture to provide communication between the angular space 13 and the cylindrical space 15 so that thev two spaces may function as a single lubricant chamber. lPreferably a number of such apertures are provided, including -apertures 18 for direct communication between the two ispaces and apertures 15J for direct communication from the annular space 13 to the periphery of each stub shaft 23. Any suitable passage means 'may be provided for introducing lubricant into either the annular space 13 or the cylindrical space 15. For example, asbest shownv in Fig. 1'0, a lubricant fitting d may be mounted 'in a bore 8l in the outer tubular` member 12, one of the spools 33 having an aperture 82 clearing the lubricant fitting. Fig. 10 also shows that the outer tubular member 12 is provided with the previously described semi-cylindrical key 29 for engagement with the various `discs and spools mounted thereon.

The form of the invention shown in Figs.V 9 and 10 has certain advantages over the earlier described embodiments in that it providesv for greaterv lubricant `capacity and provides unrestricted lubricant passages direct to the periphl eral surfaces of the tWo stub shafts.

While the embodiments of my invention hereinbefore illustrated and described are fully capable of fullling the objects and advantages primarily stated, there are other embodiments i to said tubular member and bearing against the;

inner ends of said axles for transmitting thrust from said discs through said axles tor said Vframe members; packing means in each of said chambers engaging said Wall, said means deiining a reservoir Within said tubular member and sealing such reservoir against the escape of lubricant therefrom and the entrance of abrasive matter thereto; and a closable opening in said tubular member for supplying lubricant to the reservoir. Y

2. In a disc harrow, the combination of: frame members; stub axles so connected to said memy bers as to be axially shiftable and nonrotatable relative thereto; a tubular member rotatably mounted upon said axles, the interior Wall of said tubular member having walls cooperating with said axles in providing an annular chamber intermediate the ends of each of said axles, discs secured to said tubular member; pins connected to said tubular` member and bearing against the inner ends of said axles for transmitting thrust from said discs through said axles to said frame members; packing means in each of said chambers extending throughout substantially all of the axial length of said chambers and Yresiliently engaging the outer Walls of said chambers, said means dening a reservoirwithin saidtubular member and sealing such reservoir against the escape of lubricant therefrom and the entrance of abrasive matter thereinto; and a closable opening in said tubular member for supplying'lubricant to the reservoir.

3. In a disc barrow, the combination of: frame vmembers; stub axles so connected to said members as to be axially shiftable and nonrotatable relative thereto; a tubular member rotatably mounted upon said axles, said axles having annular channels therein cooperating with said tubular members indeiining a plurality of annular chambers Yintermediate the ends of Veach of said axles; discs secured to said tubular member; pins connected ,to` said tubular member and bearing against the inner ends of said axles for transmitting thrust from said discs through said axles to said frame members; packing'means in each'of said chambers extending throughout substantially all of the axial length of said chambers and resiliently engaging the outer Wall of said chambers, said means defining a reservoir Within said tubular member and sealing such reservoir against the escape of lubricant therefrom and' the entrance of abrasive matter thereint'and a closable opening in said tubular member for supplying lubricant to the reservoir. Y

4. In a disc harrow, the combination of: frame members; stub axles so connected to said members as to be axially shiftable and nonrotatable relative thereto; a tubular member rotatably mounted upon said axles; said tubular member having an inner Wall cooperating with said axles in providing an annular chamberV intermediate the ends of each of said axles, and having a longitudinal key on the outer surface thereof; discs mounted upon said tubular member, each of said discs having a recess therein for said key on said tubular member; spacing elements mounted upon said tubular member between adjacent discs, each of said elements having a recess therein for the reception of said key on said tubular member; pins removably connected to Y said `tubular member and bearing against the ends of said axles for transmitting thrust from said discs through said axles to said frame members; packing means in each of said chambers engaging said Wall, said means defining a reservoir Within said tubular member and sealing such reservoir against the escape of lubricant `therefrom and the entrance of abrasive matter thereto; and a closable opening in said tubular member for supplying lubricant to the reservoir.

5. In a disc harrow, the combination of: frame members; stub axles so connected to said members as tombe axially shiftable and nonrotatable. relative thereto; a tubular member rotatably mounted upon said axles, said tubular member having an inner Wall cooperating with said axles in providing an vannular chamber intermediate the ends of each of said axles; discs secured to vsaid tubular member; pins removably connected to said tubularv member and bearing against the inner ends of said axles for transmitting thrust from said discs through said axles to said frame members; packing means in each of said chambers engaging said Wall, said means dening a reservoir Within said tubular member and sealing such reservoir against the escape of rlubricant therefrom and the entrance of abrasive matter thereinto; and a closable opening in one of said axles for supplying lubricant to the reservoir.

6. In a disc barrow, the combination of: frame members; stub axles nonrotatably connected to said members; Va tubular member rotatably mounted upon said axles, said tubular member having an inner Wall cooperating with said axles in providing an annular chamber intermediate the ends of each of said axles; discs securedto n said tubular member; pins removably'connected to said tubular member and bearing against the inner ends of said'axles for transmitting thrust from said discs through said axles to said frame members; packing means in each of said chambers engaging said wall, said means defining a reservoir Within said tubular member and sealing such reservoir against the escape of lubricant therefrom and the entrance of abrasive matter thereinto; and a closable opening in said tubular member for supplying lubricant to the reservoir.

7. In a disc harrovv construction, the combination of t frame members; stub shafts connected to said members;'a tubular disc supporting member mounted upon said shafts; 'discs secured upon said supporting member; thrust members associated with said supporting member and projecting across the interior thereof in engagement with the ends of said shafts; and packing means between each of said shafts and said supporting member.

8. In a disc harrow construction, the combination of: frame members; stub shafts connected to said members, each of said shafts having a thrust bearing surface on the inner end thereof; a tubular disc supporting member mounted upon said shafts; discs secured upon said supporting member; packing means between each of said shafts and said supporting member defining a lubricant chamber in the interior of said disc supporting member; thrust members for cooperation with said shafts secure-d to said supporting member and projecting into said lubricant chamber, each of said thrust members having a bearing surface incongruent with said bearing surface of the corresponding shaft whereby successive portions of one of each of said pairs of cooperating bearing surfaces are out of engagement with the other cooperating bearing surface during successive stages of their relative rotation; and means for supplying lubricant to said lubricant chamber to wash said unengaged portions of said bearing surfaces.

9. In a disc harrow construction, the combination of frame members; stub shafts connected to said members, each of said shafts having a thrust bearing surface on the inner end thereof; a tubular disc supporting member mounted upon said shafts, discs secured upon said supporting member; packing means between each of said shafts and said supporting member defining a lubricant chamber in the interior of said disc supporting member; thrust members secured to said supporting member and projecting into such lubricant chamber to bear against the inner ends of said axles, each of said thrust members having a bearing surface which is not co-extensive with the adjacent shaft thrust bearing surface.

l0. In an implement construction, the combination of: frame members; stub axles nonrotatably secured thereto; a supporting member having a bore therein and rotatably mounted upon said axles, each of said axles being provided with a thrust bearing surface within such bore; a ground working implement attached to said supporting member; thrust members connected to said supporting member and having bearing surfaces engaging said bearing surfaces of said axles but not co-extensive therewith; and means for maintaining a lubricant in contact with those portions of each of said bearing surfaces out of engagement with its companion bearing surface.

1l. In an implement construction, the combination of: frame members; stub axles nonrotably secured thereto; a supporting member having a bore therein and rotatably mounted upon said axles, each of said axles being provided with a thrust bearing surface within said bore; a ground working implement attached to said supporting member; thrust members connested to said supporting member and having bearing surfaces engaging said bearing surfaces of said axles but not co-extensive therewith; walls forming a packing chamber between each of sai-d axles and said supporting member; packing means in each packing chamber defining with the bore of said supporting member a lubricant chamber; and means communicating with said lubricant chamber permitting the introduction of lubricant thereto and preventing the escape of lubricant therefrom.

12. In an implement construction, the combination of: frame members; stub axles non-rotatably secured thereto; a supporting member having a bore therein and rotatably mounted upon said axles, each of said axles being provided with a thrust bearing surface within said bore; a ground working implement attached to said supporting member; thrust members connected to said supporting member and having bearing surfaces engaging said bearing surfaces of said axles but not co-extensive therewith; walls forming a packing chamber between each of said axles and said supporting member; packing means in each packing chamber defining with the bore of said supporting member a lubricant chamber; a resilient element engaging each of said packing means and maintaining said means in sealing relationship with one of said Walls of said packing chamber; and means communicating with said lubricant chamber permitting the introduction of lubricant thereto and preventing the escape of lubricant therefrom.

13. In an implement construction the combination of :frame members; axles secured to said members; a supporting member having a bore therethrough and journaled upon said axles, each of said axles being provided with thrust bearing means within said bore; a ground working implement attached to said supporting member; thrust bearing means connected to said supporting member and provided with a thrust bearing surface for engagement with a thrust bearing surface of said bearing means of said axles, said thrust bearing surfaces in engagement being incongruent; and packing means between each of said axles and said supporting member.

14. In an implement construction, the combinationl of frame members; axles so secured to said members as to be axially adjustable relative thereto; a supporting member having a bore therethrough and journaled upon said axles, each of said axles being provided with thrust bearing means within said bore; a ground Working implement attached to said supporting member; thrust bearing means connected to said supporting member and provided with thrust bearing surfaces for engagement with thrust bearing surfaces of said bearing means of said axles respectively, each cooperating pair of said thrust bearing surfaces being incongruent, one of each pair of said cooperating bearing means being removable; and packing means between each of said axles and said supporting member.

15. In an implement construction, the combination of frame members; axles so secured to said members as to be axially adjustable relative thereto; a supporting member having a bore therethrough and journaled upon said axles, each of said axles being provided with thrust bearing means within said bore; a ground working implement attached to said supporting member; thrust bearing means connected to said supporting member and provided with a thrust bearing surface for engagement with a thrust bearing surface of said bearing means of said axles, said thrust bearing surfaces in engagement being incongruent, one of each of said bearing means being removable; packing means between each of said axles and said supporting member defining a lubricant chamber in said bore of said supporting member; and means for supplying lubricant to said bore.

16. In a disc harrow construction, the combination of: a frame member; stub shafts con- Anected tosaid'frame member; a disc supporting tially throughout the length of said supportingv member; discs secured upon said supporting member in engagement with said key means; spacer members on said supporting member intermediate said discs; and thrust members operative between said disc supporting member and said stub shafts'to limit axial movement of said supporting member relative to said shafts.

17. In a disc harrow construction, the combination of: a frame member; stub shafts connected to said frame member; a tubular member rotatably embracing said stubV shafts; a disc supporting member surrounding said tubular mem-,-V

ber in radially spaced relation thereto and forming therewith an annular space; annular means at each end of said supporting member securing the disc supporting member to said tubular member and'closing the ends of said annular space; and thrustmeans cooperative with said tubular member and said shafts to limit axial movement of the tubular member relative to said shaft, there being an entrance to said annular space for the-introduction of lubricant thereinto and openings in said tubular member for transmission of lubricant from said annular space to said thrust'means. v

18. In a disc harrow construction, the combination of: a frame member; stub shafts connected to said frame member; a tubular member rotatably embracing said stub shafts and formingl a cylindrical lubricant space therebetween; a disc supporting member surrounding said tubular member in radially spaced relation thereto and forming therewith an annular space; annular means at each end of said supporting member se` curing the supporting member to said tubular member and closing the ends of said annular space, said tubular member being apertured to provide communication between said cylindrical space and said annular space, there being a passage to one of said spaces for the introduction of lubricant thereinto; and thrust members mounted on said tubular member in engagement with said shafts to limit axial movement of the tubu' lar member relative to said shafts.

19. In a disc harrow construction, the combination of: v a frame member; stub shafts connected to said frame member; a tubular member rotatably embracing said stub shafts and. forming a cylindrical lubricant space therebetween; a disc supporting member surrounding said tubular member in radially spaced relation thereto and forming therewith an annular space; annular means at each end of said supporting member `securing the disc supporting member to saidtubular member and closing the ends of said annular space, said tubular member having apertures at the peripheries of each of said shafts and at said intermediate cylindrical space, thereby providing for communication between said spaces, there being a passage to one of said spaces for the introduction of lubricant thereinto; discs se- V cured upon said supporting member; thrust members mounted on said tubular member in engagement with said shafts to limit axial movement of the tubular member relative to said shafts; and packing means between each of said shafts and said supporting member beyond the range of said apertures in the tubular member to prevent the escape of lubricant from said cylindrical and annular spaces and to prevent the entrance of abrasive matter thereinto.

20. In an implement construction the combination of a frame; shaft members connected to said frame; a tubular tool-supporting member mounted upon saidshaft members, said members providing annular recesses; and a packing ring of resilient material in the form of an incomplete annulus in each of saidrrecesses, sealing the space between said members and defining with said members a lubricant chamber.l

' Y OTTO W. DOMRIES. 

